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Q.

The molality of urea solution in which 0.0100g of urea ${({NH}_{2})}_{2} CO$ is added to 0.3000 $d m^{3}$ of water at 4 ${}^{\circ}C$ is ___?

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a

$5.55 \times 10^{- 4} m$

b

33.3 m

c

$3.33 \times 10^{- 2} m$

d

0.555 m

answer is A.

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Detailed Solution

Molality=moles of solute /mass of solvent in kg

$= \frac{0.01 / 60}{0.3} = \frac{0.01}{60 \times 0.3} = 5.55 \times 10^{- 4} m$

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The molality of urea solution in which 0.0100g of urea NH22CO is added to 0.3000 dm3 of water at 4C ∘ is ___?